A method and a device for controlling autonomous driving in an autonomous driving vehicle are provided. The method may include collecting state recognition information during travel, receiving information on a driver-requested automation level, determining a currently applicable maximum automation level based on the collected state recognition information, comparing the driver-requested automation level with the currently applicable maximum automation level to determine whether automation level downward adjustment is required, and adjusting an automation level downward to perform the autonomous driving when it is determined that the automation level downward adjustment is required.